DIGITUS 25G SFP28 Passive Direct-Attach Copper Twinax Cable are a high-performance, energy-saving, short-range connectivity solution 25G Ethernet application, switches, high performance computer, data storage arrays and telecom system. It consists of a shielded twinax copper cable with pluggable connectors on either end. Passive DAC cable have no electrical components built into the cable assembly and recommend for short transmission distance.